<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>example</title>
    <link rel="stylesheet" href="base.css">
    <style>
        html.body{
            width: 100%;
            /* margin: 0 auto; */
        }
        img{
            height: 100%;
            width: 100%;
            /* margin: 0 auto; */
        }
        .pic{
            width: 74.9633%;
            margin:0 auto;
        }
    </style>
</head>
<body>
    <div class="pic">
        <img src="农业科普.jpg" alt="">
    </div>
    <!-- <img src="主页.jpg" alt=""> -->

</body>
</html>